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PENNSYLVANIAN-PERMIAN • Quiescence • Volcanism Ceases • Havallah Basin of Extension? • Passive Margin (?) Shelf Sedimentation Ancestral Rockies Uplift • Paradox Basin & Uncompaghre Uplift • Transgressive Association • Allegheny Events in Marathon/Ouachita Belt 1 Sonoma Orogeny •Late Permian and early Triassic age •Change from passive to active margin conditions •Emplacement of Golconda Allochthon •Truncation of NE-SW trending continental margin in Mojave area •Formation of a new active margin 2 Golconda Allochthon • Upper plate – Argillite, sandstone, volcanic rocks • Lower plate – Carbonates and clastics Havallah Basin • Source for Golconda rocks • Either a passive margin or a marginal basin • Source of materials – Sediments from Antler thrust to the east – Andesitic source to the west Stratigraphy of Havallah Basin • Early Mississippian Sediments from Antler Thrust Belt • Upper Mississippian Pillow Lava and Radiolarian Chert • Penn/perm Carbonate Turbidities from the East • Early Permian Basaltic Volcanism • Late Permian Arc Derived Detritus 3 Related Depositional Consequences Environments • Continental shelf to the east • Havallah Basin Closed – Penn/Perm transgressive marine • Volcanic Basinal Rocks Thrust sequences Eastward • Island arc to the west • West Facing or East Facing Arc? – Andesite through rhyolites preserved in Klamath Mts. and Sierra Nevada Nevadan Orogeny (162-144 Ma) • General – Turbidite Deposition Across Ophiolites and Synchronous Deformation Define Orogeny • Plate Edge – Fore Arc Basins Source of Ophiolites • Isolated Magmatism as Small Plutons Plate Interior • Foreland fold and thrust belt • Major sediment source to the west • Trough near the highland • Syntectonic intrusions – Orogenic highlands Nevada, Utah, Idaho 4 Plate Kinematic Patterns • NW acceleration to 200 Km/Ma • Sinestral tangential motion – Relative to plate edge 5.

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California Terranes
Geological Society of America Special Paper 338 1999 California terranes Eldridge M. Moores Department of Geology, University of California, Davis, California 95616 Yildirim Dilek Department of Geology, Miami University, Oxford, Ohio 45056 John Wakabayashi 1329 Sheridan Lane, Hayward, California 94544 ...subjected to the principle of least astonishment, geologic science has always tended to adopt the most sta- tic interpretation allowed by the data, and evidence indicating displacements larger than conceivable...has consis- tently met strong resistance. Seeber, 1983, p. 1528 A vital lesson of plate tectonics is that there is no validity to any assumption that the simplest and therefore most acceptable interpretation demands a proximal rather than a distant origin. Coombs, 1997, p. 763 INTRODUCTION been working in ophiolites for some six years, first on the Vouri- nos complex in northern Greece and subsequently on the Troodos Two of this volume’s coeditors persuaded the third into com- complex in Cyprus (Moores and Vine, 1971). At the Penrose con- menting on his own paper. There are three clear alternatives as a ference I reported on the evidence for sea-floor spreading in the “classic paper” on California terranes. In the first of these, Hamil- Troodos complex, although I had not yet made the connection to ton (1969) first mentioned the North American Cordillera as a col- all ophiolites. One of the informal breakout sections at the Pen- lage of exotic terranes and argued that the continental margin of rose conference was devoted to discussion of the problem of North America was built out from the shelf edge by material car- ophiolite emplacement.
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University of Nevada Reno (Jreeology of Paleozoic Basinal Rocks in The
i \ University of Nevada Reno (jreeology of Paleozoic Basinal Rocks in the Northern Fox Range; Washoe County, Nevada A thesis submitted in partial fulfillment of the requirements for the degree of Master of Science in Geology. by Mark F. Thiesse V i August 1988 11 MINES LIBRARY The thesis of Mark F. Thiesse is approved: 2H03 Thesis Advisor Department Chairman Dean, Graduate School University of Nevada Reno August 1988 iii ACKNOWLEDGEMENTS I would like to thank Dr. R .A. Schweickert for his help, encouragement and patience throughout this project. Dr. Bruce Wardlaw provided the conodont identification which suggested the Carboniferous (?) age of the metamorphic rocks. Other thanks go to Andy Markos and Bob Strobel for help with the thin sections and interesting discussions. And finally, thanks to Carol for typing and for funding this project. iv ABSTRACT The Fox Range in Northwestern Nevada is a typical Basin and Range fault block mountain range which has been tilted about 30° to the east, accelerating the erosion of Tertiary volcanic rocks along the steep western flanks, and exposing Paleozoic metamorphic rocks. The Paleozoic rocks consist of a very fine grained, siliceous mudstone which was regionally metamorphosed from mid-greenschist to mid-amphibolite facies producing argillite, schist, limestone, quartzite, and gneiss. These Paleozoic rocks exhibit three generations of structures. Di created the schistose and gneissic layering common throughout the range, along with abundant tight to isoclinal folds. D2 structures are dominated by two large, map-scale antiforms and occasional smaller, open to tight, east to northeast trending folds and assorted lineations. D3 structures are limited to a few north-south trending, open to gentle folds which affect all pre-Tertiary lithologies.
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[Italic Page Numbers Indicate Major References] Abajo Mountains, 314
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